Diseño, simulación y comparación de esquemas de control adaptativo aplicados a plantas no lineales de parámetros variables y retardo de tiempo dominante

Abstract

This work presents the design, simulation, and comparison of adaptive control schemes applied to nonlinear processes with variable parameters and dominant time delay. These schemes are a Smith predictor controller with a gain scheduling block based on fuzzy logic, a gain scheduling PID controller and an adaptive PID controller with a supervisory block based on fuzzy logic. To simplify the design and tuning of the controllers, an approximation of the processes’ nonlinear models to first order plus dead time models is carried out. Additionally, the control schemes are compared to each other using ISE and TVu performance indices when the control loop is subjected to tests such as step-type reference changes and disturbances rejection. Finally, a graphical interface is presented to visualize the processes responses, the signals provided by the controllers and the ISE and TVu indices.